|
@@ -1,5 +1,6 @@
|
|
|
/*
|
|
|
* Copyright (C) 2003 Sistina Software
|
|
|
+ * Copyright (C) 2006 Red Hat GmbH
|
|
|
*
|
|
|
* This file is released under the GPL.
|
|
|
*/
|
|
@@ -14,11 +15,17 @@
|
|
|
|
|
|
static struct bio_set *_bios;
|
|
|
|
|
|
+struct dm_io_client {
|
|
|
+ mempool_t *pool;
|
|
|
+ struct bio_set *bios;
|
|
|
+};
|
|
|
+
|
|
|
/* FIXME: can we shrink this ? */
|
|
|
struct io {
|
|
|
unsigned long error;
|
|
|
atomic_t count;
|
|
|
struct task_struct *sleeper;
|
|
|
+ struct dm_io_client *client;
|
|
|
io_notify_fn callback;
|
|
|
void *context;
|
|
|
};
|
|
@@ -26,12 +33,24 @@ struct io {
|
|
|
/*
|
|
|
* io contexts are only dynamically allocated for asynchronous
|
|
|
* io. Since async io is likely to be the majority of io we'll
|
|
|
- * have the same number of io contexts as buffer heads ! (FIXME:
|
|
|
- * must reduce this).
|
|
|
+ * have the same number of io contexts as bios! (FIXME: must reduce this).
|
|
|
*/
|
|
|
static unsigned _num_ios;
|
|
|
static mempool_t *_io_pool;
|
|
|
|
|
|
+/*
|
|
|
+ * Temporary functions to allow old and new interfaces to co-exist.
|
|
|
+ */
|
|
|
+static struct bio_set *bios(struct dm_io_client *client)
|
|
|
+{
|
|
|
+ return client ? client->bios : _bios;
|
|
|
+}
|
|
|
+
|
|
|
+static mempool_t *io_pool(struct dm_io_client *client)
|
|
|
+{
|
|
|
+ return client ? client->pool : _io_pool;
|
|
|
+}
|
|
|
+
|
|
|
static unsigned int pages_to_ios(unsigned int pages)
|
|
|
{
|
|
|
return 4 * pages; /* too many ? */
|
|
@@ -118,7 +137,7 @@ static void dec_count(struct io *io, unsigned int region, int error)
|
|
|
io_notify_fn fn = io->callback;
|
|
|
void *context = io->context;
|
|
|
|
|
|
- mempool_free(io, _io_pool);
|
|
|
+ mempool_free(io, io_pool(io->client));
|
|
|
fn(r, context);
|
|
|
}
|
|
|
}
|
|
@@ -241,7 +260,9 @@ static void vm_dp_init(struct dpages *dp, void *data)
|
|
|
|
|
|
static void dm_bio_destructor(struct bio *bio)
|
|
|
{
|
|
|
- bio_free(bio, _bios);
|
|
|
+ struct io *io = bio->bi_private;
|
|
|
+
|
|
|
+ bio_free(bio, bios(io->client));
|
|
|
}
|
|
|
|
|
|
/*-----------------------------------------------------------------
|
|
@@ -264,7 +285,7 @@ static void do_region(int rw, unsigned int region, struct io_region *where,
|
|
|
* to hide it from bio_add_page().
|
|
|
*/
|
|
|
num_bvecs = (remaining / (PAGE_SIZE >> SECTOR_SHIFT)) + 2;
|
|
|
- bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, _bios);
|
|
|
+ bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, bios(io->client));
|
|
|
bio->bi_sector = where->sector + (where->count - remaining);
|
|
|
bio->bi_bdev = where->bdev;
|
|
|
bio->bi_end_io = endio;
|
|
@@ -319,8 +340,9 @@ static void dispatch_io(int rw, unsigned int num_regions,
|
|
|
dec_count(io, 0, 0);
|
|
|
}
|
|
|
|
|
|
-static int sync_io(unsigned int num_regions, struct io_region *where,
|
|
|
- int rw, struct dpages *dp, unsigned long *error_bits)
|
|
|
+static int sync_io(struct dm_io_client *client, unsigned int num_regions,
|
|
|
+ struct io_region *where, int rw, struct dpages *dp,
|
|
|
+ unsigned long *error_bits)
|
|
|
{
|
|
|
struct io io;
|
|
|
|
|
@@ -332,6 +354,7 @@ static int sync_io(unsigned int num_regions, struct io_region *where,
|
|
|
io.error = 0;
|
|
|
atomic_set(&io.count, 1); /* see dispatch_io() */
|
|
|
io.sleeper = current;
|
|
|
+ io.client = client;
|
|
|
|
|
|
dispatch_io(rw, num_regions, where, dp, &io, 1);
|
|
|
|
|
@@ -348,12 +371,15 @@ static int sync_io(unsigned int num_regions, struct io_region *where,
|
|
|
if (atomic_read(&io.count))
|
|
|
return -EINTR;
|
|
|
|
|
|
- *error_bits = io.error;
|
|
|
+ if (error_bits)
|
|
|
+ *error_bits = io.error;
|
|
|
+
|
|
|
return io.error ? -EIO : 0;
|
|
|
}
|
|
|
|
|
|
-static int async_io(unsigned int num_regions, struct io_region *where, int rw,
|
|
|
- struct dpages *dp, io_notify_fn fn, void *context)
|
|
|
+static int async_io(struct dm_io_client *client, unsigned int num_regions,
|
|
|
+ struct io_region *where, int rw, struct dpages *dp,
|
|
|
+ io_notify_fn fn, void *context)
|
|
|
{
|
|
|
struct io *io;
|
|
|
|
|
@@ -363,10 +389,11 @@ static int async_io(unsigned int num_regions, struct io_region *where, int rw,
|
|
|
return -EIO;
|
|
|
}
|
|
|
|
|
|
- io = mempool_alloc(_io_pool, GFP_NOIO);
|
|
|
+ io = mempool_alloc(io_pool(client), GFP_NOIO);
|
|
|
io->error = 0;
|
|
|
atomic_set(&io->count, 1); /* see dispatch_io() */
|
|
|
io->sleeper = NULL;
|
|
|
+ io->client = client;
|
|
|
io->callback = fn;
|
|
|
io->context = context;
|
|
|
|
|
@@ -380,7 +407,7 @@ int dm_io_sync(unsigned int num_regions, struct io_region *where, int rw,
|
|
|
{
|
|
|
struct dpages dp;
|
|
|
list_dp_init(&dp, pl, offset);
|
|
|
- return sync_io(num_regions, where, rw, &dp, error_bits);
|
|
|
+ return sync_io(NULL, num_regions, where, rw, &dp, error_bits);
|
|
|
}
|
|
|
|
|
|
int dm_io_sync_bvec(unsigned int num_regions, struct io_region *where, int rw,
|
|
@@ -388,7 +415,7 @@ int dm_io_sync_bvec(unsigned int num_regions, struct io_region *where, int rw,
|
|
|
{
|
|
|
struct dpages dp;
|
|
|
bvec_dp_init(&dp, bvec);
|
|
|
- return sync_io(num_regions, where, rw, &dp, error_bits);
|
|
|
+ return sync_io(NULL, num_regions, where, rw, &dp, error_bits);
|
|
|
}
|
|
|
|
|
|
int dm_io_sync_vm(unsigned int num_regions, struct io_region *where, int rw,
|
|
@@ -396,7 +423,7 @@ int dm_io_sync_vm(unsigned int num_regions, struct io_region *where, int rw,
|
|
|
{
|
|
|
struct dpages dp;
|
|
|
vm_dp_init(&dp, data);
|
|
|
- return sync_io(num_regions, where, rw, &dp, error_bits);
|
|
|
+ return sync_io(NULL, num_regions, where, rw, &dp, error_bits);
|
|
|
}
|
|
|
|
|
|
int dm_io_async(unsigned int num_regions, struct io_region *where, int rw,
|
|
@@ -405,7 +432,7 @@ int dm_io_async(unsigned int num_regions, struct io_region *where, int rw,
|
|
|
{
|
|
|
struct dpages dp;
|
|
|
list_dp_init(&dp, pl, offset);
|
|
|
- return async_io(num_regions, where, rw, &dp, fn, context);
|
|
|
+ return async_io(NULL, num_regions, where, rw, &dp, fn, context);
|
|
|
}
|
|
|
|
|
|
int dm_io_async_bvec(unsigned int num_regions, struct io_region *where, int rw,
|
|
@@ -413,7 +440,7 @@ int dm_io_async_bvec(unsigned int num_regions, struct io_region *where, int rw,
|
|
|
{
|
|
|
struct dpages dp;
|
|
|
bvec_dp_init(&dp, bvec);
|
|
|
- return async_io(num_regions, where, rw, &dp, fn, context);
|
|
|
+ return async_io(NULL, num_regions, where, rw, &dp, fn, context);
|
|
|
}
|
|
|
|
|
|
int dm_io_async_vm(unsigned int num_regions, struct io_region *where, int rw,
|
|
@@ -421,7 +448,7 @@ int dm_io_async_vm(unsigned int num_regions, struct io_region *where, int rw,
|
|
|
{
|
|
|
struct dpages dp;
|
|
|
vm_dp_init(&dp, data);
|
|
|
- return async_io(num_regions, where, rw, &dp, fn, context);
|
|
|
+ return async_io(NULL, num_regions, where, rw, &dp, fn, context);
|
|
|
}
|
|
|
|
|
|
EXPORT_SYMBOL(dm_io_get);
|